Electric baseboard heater not working
An electric baseboard heater not working almost always comes back to two things: the breaker and the thermostat. Most baseboard heaters run on 240 volts through a double breaker, and a tripped breaker can sit almost in the normal position while leaving the heater dead. Furniture or curtains pressed against the heater can also trip its overheat cutout. If those check out and the heater still stays cold, the problem is usually the thermostat or the heating element, and that's wiring work. Baseboard heaters are simple. When one quits, it's usually the breaker, the thermostat or something blocking it.
How a baseboard heater works
A baseboard heater is a long metal element inside a row of thin fins. Electricity heats the element, the fins pass that heat to the air, and warm air rises out the top while cooler air is drawn in at the bottom. There's no fan, so it relies entirely on that natural airflow.
Most are controlled by a line-voltage thermostat, either on the wall or built into one end of the heater. That thermostat switches the full 240 volts on and off. A high-limit switch inside the heater cuts power if it gets too hot, usually because something is blocking air.
Why it stops heating
A tripped handle can look almost on.
It no longer clicks on or switches power.
Blocked airflow tripped the high-limit switch.
The heater gets power but stays cold.
| You notice | Likely cause | Start at |
|---|---|---|
| No click when turned up | Thermostat | Step 1 |
| Completely cold | Tripped breaker | Step 2 |
| Worked, then shut off | Overheat cutout | Step 3 |
| Burning dust smell | Dirty fins | Steps 4 and 5 |
| Has power, still cold or cold spots | Failed element or thermostat | Step 6 |
Let's fix it
- Check the thermostatTurn the thermostat all the way up and wait several minutes. You should hear a click when it turns on. If it's a built-in dial on the heater, make sure it isn't set to off or the lowest mark. Line-voltage thermostats can wear out and stop clicking, which is a common reason a single heater goes cold.
- Reset the breakerFind the heater's breaker in your panel. It's usually a double breaker, two handles tied together, sometimes labeled 20 or 30. If the handles sit in the middle or look slightly off, push them fully to off, then back on. A tripped breaker often rests just short of on, so it can look normal at a glance.
- Clear the space around itMove furniture, beds, curtains and boxes at least a foot away from the heater, and make sure nothing is stuffed underneath. Blocked airflow makes the heater overheat, and the high-limit cutout shuts it off until it cools. If it worked for a while and then quit, this is a likely cause.
- Turn off the power and confirm itSwitch off the heater's breaker. Don't rely on the thermostat being turned down, since many only break one leg of the 240-volt circuit. Use a non-contact voltage tester at the thermostat and along the heater to make sure there's no power before you remove any cover.
- Clean the finsTake off the front cover, usually held by clips or a couple of screws. Vacuum the fins with a brush attachment and loosen dust with a soft brush. Go gently; the fins bend easily. Dust buildup cuts heat output, causes a burning smell, and can trip the high-limit switch. Look for loose objects, scorch marks or melted insulation while you're in there.
- Test and decidePut the cover back, restore the breaker and turn the thermostat up. If the heater warms only partly, or not at all, and the breaker is on, the element, the high-limit switch or the thermostat has likely failed. Replacing a thermostat or heater means working with 240-volt wiring, so call an electrician unless you're experienced with it.
Watch it done
- The thermostat clicks and the heater warms within a few minutes
- The whole length of the heater gets warm
- It stays on until the room warms up
If it still won't heat
If several heaters in the house stopped at the same time, the problem is likely a shared circuit or thermostat, not the heaters. An electrician can trace it.
If the heater has cold spots along its length, part of the element may have failed or fins may be crushed. Straightening fins can help, but a failed element usually means replacing the heater.
What a pro typically charges (a rough estimate; prices vary by area): An electrician's service call usually runs $100–$250. Replacing a line-voltage thermostat typically costs $150–$350, and replacing a baseboard heater runs about $300–$700 installed.
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Baseboard heater questions
Why is my baseboard heater not working?
Usually a tripped breaker, a failed thermostat, or the overheat cutout from blocked airflow.
Do baseboard heaters have a reset button?
Most don't have one you can reach. The high-limit switch resets itself once the heater cools.
How far should furniture be from a baseboard heater?
Keep furniture and curtains at least 12 inches away, and never cover the heater.
Can I replace a baseboard heater thermostat myself?
It's 240-volt wiring. If you're not experienced with it, have an electrician do it.
Why is my baseboard heater cold?
Usually it's a tripped double breaker or the thermostat. Furniture or curtains pressed against it can also trip its overheat cutout.